Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '156a3c9fc5943a3851cc20c1c5eef8fa0c769963023bc67d45ec8d1ad346b09a' 
  AND token = 'ljIv+9KNcj/YPwTrTw5F0vYhWf0mKUD2MgYNJGGco3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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