SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '30f042955fe996d42a21e246c40d45b69eacb886034b50c952080bf3f003be74' 
  AND token = 'wmuvpZfJ0KxpOGtf4up0YFhnav+P30ZlFhohRf66w3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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