SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '38b165493098e0d4133c252899f7b4ba7bbf3095907ad618c4d55dc84c2d2e99' 
  AND token = 'ig7xswjVtAFXFgWX9lWAH0Q97L4OKlLKO9A+G7/kf1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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