Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f98a70bcc8244431ee9908a4c2667b388cf73f57fd3da289d54abaa878e0bee' 
  AND token = 'DIIU/xaKdhe2tw1RMD3ltFOoYVeeq6LWEASVu/9VLgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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