Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c744e48d9808426cbe9a2d3254f588c4cffe44a2a68eeb7adeeb8f9b577a77' 
  AND token = 'DjM1TtMnIs6aiyar1QMNg4mYdZokg6SgIY4gvWAW+PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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