You are tasked with designing the infrastructure for a high-throughput web service on Google Cloud for a business that prioritizes low costs. The web service must handle 500,000 requests per second, where the data received will be stored and later queried in real-time based on exact attribute matches. The traffic is highly variable, with periods where the service receives no requests at all. Given these requirements, which combination of Google Cloud web service platform and database would be most suitable?