Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c351d5c20519e0ab73a5517a43256426a718536fda6929ed0bfb9e4892602215' 
  AND token = '5iKCZgPaTUqKB5f5/Wv+yk6v7A7t2QcOMIwO8RcBtgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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