Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '835bc251a1f8737306286bdc8f541d3e5d9762c2dbffa992a73d41ac268ce7fc' 
  AND token = 'q8k2z4GElJczwdAlmaRSOnDDw4vGZl6lLycZ5ImVplA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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