Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44788fc05839c7ec6dba024a1d698ec8cbfa0b61159beab8fa105c61cefaa5db' 
  AND token = 'MCJ1QAZyMAm45nFNqn8YaSWSVPB8BrSkEPkK5MJ20xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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