Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd29c1837270ed67e9b7a48d3949c0213d4ee4e82fab2af204cb9c7c83cd5ce50' 
  AND token = 'A9VZUYzv89TrEbKQOfwIyHwz+2tUSDVLqLzDCh+OdcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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