SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1d570d85199dd370f22e6a278acff29c3e8cd07c7c90107bf76d5b7283a6ba45' 
  AND token = '7vDpa/yKhQTXYstY1+DcnoVnv54guRr7E+UgWVj9xjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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