Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd30ab35f2f0b17447df135d2886e262f4cbd0f6ac6d4f7686a6c101288a4ee9d' 
  AND token = 'xITcM6/eEBHQ62TaTDVm/IVCgV0q206iKZCIiRaY7oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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