Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e50bf33dba3530e1d1d374fcada37e0ee2d10ffc2ee27cd4d30307d243c4876' 
  AND token = 'iKMX+jdWWjefflrbl1GGYKI0WAFt6Wh5r37wRVQVRzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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