Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db68499a8c6de28949def4bb9909f1633b5c6c83bc436cafaeba40a569f68b8' 
  AND token = 'TREg6qRygzx3vI6V167nDPgN5A/xQ1KBCPZYQn0tDFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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