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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '969852795d6b1e788f9cb3552e64c34bc64eae1ab29ccedacc02440a6c8fb250' 
  AND token = '9ryGTrIhAYxK0OgeB9/1Kiq95J60FtePk7tCccQUI1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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