Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fe9fd5c6e4f50064f97ae1ebf1704e742f2e292e3fe9a20e265e60ea7a10892' 
  AND token = '4xvwJwYXCLqHsuKkO50UZDAEoQjlwz26sEOdg8piHaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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