Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '624277edddfef2a3aaf55030fdb33ce1e5f5636312e5ea7e50d41fd7fa486c73' 
  AND token = '8IyIRcU+qOiUr5DEFDp+mUtsJoi0QuzqaXaT2UwF+0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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