fix(premium-podcasts): update query to validate subscription

modules/PremiumPodcasts/Models/SubscriptionModel.php

@@ -116,11 +116,13 @@ class SubscriptionModel extends Model
 
         return $subscriptionModel
             ->where([
-                'token'      => hash('sha256', $token),
-                'status'     => 'active',
-                'expires_at' => null,
+                'token'  => hash('sha256', $token),
+                'status' => 'active',
             ])
+            ->groupStart()
+            ->where('expires_at', null)
             ->orWhere('`expires_at` > UTC_TIMESTAMP()', null, false)
+            ->groupEnd()
             ->first();
     }