Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '387271d7b336d61bb83849757d2db18a7934c210673f98f9d314c26894ae732f' 
  AND token = 'uwVt8fRrpXQUwsHw4R7DFTCSj+C1zFYfZAp2XmTQu2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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