Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f69a23f9b21146077936e4615cde9b2b29659e90aa5b7aca494aaf4aed95d3c' 
  AND token = 'sigVU2SwwtMTQt3xC+Z8Z34emVKySEy0lBzaij69Cj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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