SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ccae07a957b624c160cd0740d30dfa4c0c908942b330d1f3f57b3d8b5aa37417' 
  AND token = 'pFc2tbg9go3wWqLJHBM+gVu9TSdlE803BULmCBHH5DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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