SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '70534fc65944bddb4eef5757ea148dc1a168064e7f1bdbcc62c158879c2db733' 
  AND token = '14LBCgn5tZvkahvqzWtICVgWxOVTRxgFJ0InTm8lzpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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