Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adb7e0d0ecbb90f787a70b66d4bab41b8bb84dfe8d9b112953998779b4b4aff3' 
  AND token = 'rKdETNgwsz8DJxEwoHhEXI/MOM/NAUSs5MLB0zA7uSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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