Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd39a424a9c227011ce6d77c46485e6fb77c3ab3b9a5e41c3ed8e75014cd1dd96' 
  AND token = 'tsBBqWhnazkNtE3yxWjSfrqz4/dWQ9czrucEckp5u2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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