SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '64fe4437d59917ddea184c3080ba3003f511741a90a411f1f990ac385b922604' 
  AND token = 'sWBCkXVol9fLJKy7U+68xn5eELCbb5gn8HRN3ZGh5j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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