Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e0b7fa8f5fafd209e1d5966538135d92583f507389d999e1d7ad0dbd3b17715' 
  AND token = 'xRrN5FbCdIEzoRn93MJy/K87iMu++eMBIwvn8GnmDc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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