Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7c1f26b6662a6ac2cb716831054a34af7e011f7fe7da45a3738d2b656cd4c2b' 
  AND token = 'K9dbDN3Mqw6rXrddCd5pXjRmdKdoRnAQqK2j4d2b6mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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