Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cec784601721e644cdec1d7964694dd0551186bf712c7ce646832c5308ad776' 
  AND token = 'BU+ocd/Wo6iFCpNZUbOJsmpmidRxlfRmDGF8stJG61I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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