Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '957492911a9cfa76e5d660c03bfa38fb62317307bfc7a1554eebdc124c9ce97c' 
  AND token = '7erdkxcXjv7j3Jrd9FBGXAaqDZH6tVO5lGmL5pXKJm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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