Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '868dfd17038e72a05cbfed0765bec7218933fe500347bbcf2383ee46487e2508' 
  AND token = 'KrHDM0CQbodg9paVDZz+KbCHvn7lPj/qqMekD78XRVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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