Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb2012f11a7d90cb7fe479c01066b7edd11073b88d003e3d44a43e1ee1e21c4' 
  AND token = 'M6Ugj2y449Gky0CmsF/5T/qFldIv0jeFNLUY4gOUWX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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