Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02542fff602f810c34f1db9a5ae857e8fea77e1319e98a2072b3bcf8caf3d1e1' 
  AND token = '0FQ62nPyOFJj5joY69g96ZaKBfbkSqYEgWwK5QjLYKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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