SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2ad721b6b7b175fd2127e2e5c03b60d5f5d92406d7504fdd2afef04533b8d813' 
  AND token = 'XPwwhau5C4pl97JAMlRJ1Xv6XXlHDkuQVIKNS0fDfZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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