SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4f74b0f3dad257bdb5f8d5b312500d7eb4a90641f9dbc2535930240cfcffb8f5' 
  AND token = 'XK6GJ0TkVqBTSNd2oqy9oYrEZKssokE8A/9QmrUU5pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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