Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffe90251d6a5c29d93cb0bef6352942d72cba8f10eee1ffbd63b6ace53ec415d' 
  AND token = 'cs3LIcw7ct6Sxh/x79nFyqUH17LBc811puVxwJ/vJB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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