Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c2cb406c8af9ea7af77357dcdee3e96ee80d058ae44b28a06362f040c4d6ae8' 
  AND token = 'Niulw9kMGzgyYOPSVZ+E6EJlucHuiXcJsSzs+XEUmt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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