Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ab7b0bc7eac4504d0750b94d44ee1f03dae8f800e54f03fd32f60f464b45d9f' 
  AND token = '0k+OvmuRWh0ZdlSo8ozYrCNNc8YWHNJMzsxxC3vpNyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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