diff --git a/src/cache.ts b/src/cache.ts
index d570eb4..cc1d767 100644
--- a/src/cache.ts
+++ b/src/cache.ts
@@ -1,4 +1,5 @@
 import { CacheInterface } from './types/cache_interface.js'
+import { KeyValuePairInterface } from './types/key_value_pair_interface.js'
 
 /**
  * Cache is a class that implements the CacheInterface interface.
@@ -7,7 +8,7 @@ import { CacheInterface } from './types/cache_interface.js'
  * @implements {CacheInterface}
  */
 export class Cache implements CacheInterface {
-  protected cache: Map<string, { value: object; expiry: number }>
+  protected cache: Map<string, Omit<KeyValuePairInterface, 'key'>>
 
   constructor() {
     this.cache = new Map()
@@ -18,17 +19,16 @@ export class Cache implements CacheInterface {
     if (!entry) return undefined
 
     const now = Date.now()
-    if (now >= entry.expiry) {
-      console.log('Cache entry expired')
+    if (entry.expiry && now >= entry.expiry) {
       this.cache.delete(key)
       return undefined
     }
     return entry.value
   }
 
-  set(key: string, value: object, ttl?: number): void {
-    const expiry = ttl ? Date.now() + ttl : Number.POSITIVE_INFINITY
-    this.cache.set(key, { value, expiry })
+  set(pair: KeyValuePairInterface): void {
+    const expiry = pair.expiry ? Date.now() + pair.expiry : Number.POSITIVE_INFINITY
+    this.cache.set(pair.key, { value: pair.value, expiry })
   }
 
   has(key: string): boolean {
@@ -39,7 +39,7 @@ export class Cache implements CacheInterface {
     const now = Date.now()
     return Array.from(this.cache.entries())
       .filter(([key, { expiry }]) => {
-        if (now >= expiry) {
+        if (expiry && now >= expiry) {
           this.cache.delete(key)
           return false
         }
diff --git a/src/types/cache_interface.ts b/src/types/cache_interface.ts
index da9e23b..b7d4241 100644
--- a/src/types/cache_interface.ts
+++ b/src/types/cache_interface.ts
@@ -1,3 +1,5 @@
+import { KeyValuePairInterface } from './key_value_pair_interface.js'
+
 /**
  * CacheInterface is an interface that defines the structure of a cache object.
  * It includes methods for getting, setting, deleting, and clearing cache entries,
@@ -15,11 +17,9 @@ export interface CacheInterface {
 
   /**
    * Sets the value of a cache entry with the specified key.
-   * @param key - The key of the cache entry.
-   * @param value - The value to set for the cache entry.
-   * @param ttl - The time-to-live (in seconds) for the cache entry. Optional.
+   * @param pair - The key-value pair to be set.
    */
-  set(key: string, value: object, ttl?: number): void
+  set(pair: KeyValuePairInterface): void
 
   /**
    * Deletes a cache entry with the specified key.
diff --git a/src/types/key_value_pair_interface.ts b/src/types/key_value_pair_interface.ts
new file mode 100644
index 0000000..f027cf0
--- /dev/null
+++ b/src/types/key_value_pair_interface.ts
@@ -0,0 +1,5 @@
+export interface KeyValuePairInterface {
+  key: string
+  value: object
+  expiry?: number
+}