Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d14dacbf7940df21b49dc4ef2b8ba49f930dab5554b9cd48fc2bdc373e49761' 
  AND token = 'r13f8pJ5wyVPxJz6c/z7BpwkU6dLEotHfiOue7d/Sl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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