Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3bfc9b8ec4d0e1238cc2638688f561cbc5f8befc84aa564b7d8c9d61023dade' 
  AND token = 'QoYLJAxBqNXHpO14kr5+Ab4bN5UOjV1lSaiDom7J4IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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