Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16c78a74040ae4e9c15b5b86694c4a653dace82784f58607c2277217e6118504' 
  AND token = '0qvWv114+xjT2XZBd2UCi7kIIDaUEj2RkSDrZhaaTQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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