Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52b80a2ac0cd2924bbf868da37edf9143f6493d2ca8ae0a1c8444bf6daf4fc1a' 
  AND token = 'mzexEmO2mB2pfqWGTiobkTiIm3YbdBLcvdU3XaRzZ38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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