SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd96100c8d17d04e9fb77999cef7bdc537882f4246b4ded12c24c7b8fc2089002' 
  AND token = 'XkZneKTovrBYVWSMl3Qh/sOjn5+5c3HMmrSkFgLnjWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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