Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9179277961c6ff6f0ab7f69692ff891f3ac2908e7d8838cd680623497aeaa494' 
  AND token = 'PuGP56Kadm08sTIzlyzZ6JDGziU84quSrsHrVTsUAVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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