Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cbc8f6acf3856c41d09c20638a37075d085d6dee2a15ca3766564180568fa94' 
  AND token = 'UppuL4WNxetHEbG7a2c1paRDcb7Gn7BHIgZYnldDK+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}