You cannot use an MX64 without an active cloud license. If the license expires, the device stops forwarding traffic and becomes a "paperweight" after a 30-day grace period.
It is designed for up to 50 users and offers a firewall throughput of 250 Mbps . buy meraki mx64
The Meraki MX64 is no longer sold directly by Cisco for new deployments, but it is widely available through secondary markets or authorized resellers selling remaining stock or "renewed" units. You cannot use an MX64 without an active cloud license