SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3893fd642f9a6c54b77a6e8af019ab4af0d70eaf54838860027dfb1577f47cfe' 
  AND token = 'Uv+LRuOFN99sIN7vrurwK8f6gY85YOZgCOJk8ubNlLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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