Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44f0f22eebb55e46d64c78a3bb28b8cc5359e1963652a55237bbbe221bcdb855' 
  AND token = '8vUSzTsIs4/+mHuhU2w9PVN8iCydxnldXxnSMdFxTj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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