SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '824fa629e789544deb8209c03c1c2f37af9f407cbfcf612148ca682d7c423aa5' 
  AND token = 'pY9jyAQSnALN+OiqqCclyRHHd1qHkGq0/tBEkTQo36w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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