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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '624d8d374df1a4a31c97fdb740f441f0be5a61423f24e9a3dfb27e3b9939ef74' 
  AND token = 'YLX7XdODMYQWdKIg0P8z6aePE6yX9cqI9MAfQZJDC8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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