Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c67c66b4b7f9e37afdfc38e448d24fbba42d80804712fe8d2da66100fb09bd' 
  AND token = 'ZJb/TUStUYQLsXavc+4rxP7Srue2lSMFm1htS/CZw8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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