Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f163f588effb3f04188769b4abfc464e8c39a9bc4b4891ab663f9256e820d4' 
  AND token = 'xkOM/F/dYLQ0WBpZqccvXG0TrN0wZtEKWkOW1QQAvls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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