Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc7e9c3490e05e9ec4df3f5952d01a4b66ea2ca95cb78d2b6d91669e64038b09' 
  AND token = 'v7BhR3vFyiF6gbGGASIxXsjL3D/mUjh8myxEDkRp/8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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