Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a55e1155c8170ec06621c0b4fc0654ad0b558c8a00c0c4cd31902607b89bd075' 
  AND token = '5XwHIXtrRaaoqPZ2VpIjeRZXG7HpydSLgfTgAgCbSMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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