Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef6f566384fa86e7de7f9b678e2f5764d4b306c0273c39bbd6cd5d230a1be29f' 
  AND token = 'tXLXVdHx6FuWr3XmZbQq98qwbglL4TIgYBycfYzWpI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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