Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbf2768d46f0566ff192a959164a825be503fea59ba7be7520af164584db68df' 
  AND token = 'ip731eVV8N7FQuRBMSBlkDCMtNzXHLi8DdVjYZEJo4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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