Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a378c7cbfdaa35f4edf1fff85ceeb027a305601e9629ea94b9a9232bebe7a9df' 
  AND token = 'R23ySsY9BThbU9QLNjn+0mvDkwFqSPHnPfYZ0HYAIVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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