Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac8d7f62c7035557b021b4ddb8bdb46fb3c44fb6e69f6ce20b5277374ce702d3' 
  AND token = 'WutL/Y2kaG7p31BAvnEEmYzTk/7CkqTaewaO3btKhWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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