Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a9b56e75f8ef76ec28b79747de88ed48f8c6e85c7253e00ecdef29a89af25ca4' 
  AND token = 'citsBlOYGtAmx/gHCc9ZofoQlRNPFFOxdsuBtTS3XsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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