SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bad5f405a5520f36fbedc4167fc3ea6d0c9f663fb635ddab3f548037b012ec4c' 
  AND token = 'Doz9KvdkVtwkKIP80INg4J7YGElVimvN0MyWga9KGYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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