SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '69c70ba79c9ab336f5754db298e64468e70f961003d1181f3b4d50a587bb3795' 
  AND token = 'wqyS6r6d6DusjjZEhAeen7uqmX1M/LTVg3KgrM1gB3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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