SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0a05549339cc5a29537d0644edf9d2a123f1e6b6a896a8ccc745510fce6929a4' 
  AND token = 'h3q0JM6ublb4lAQmwUDsn/GYJAgA/ouxVTIHwlMT+Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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