Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c3522184bfa58d073eca2b8f3ef363a54da4a8964542e4e2ba3f35d7608af38' 
  AND token = 'oPYQzMT00MF1FbEPP0rsdNfpbLIqUi+OXg821Jm4KA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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