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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9c8db7b9cbc5a3d9f091103d27d0fc9fba6a013a84cf7192b49033197bd83a79' 
  AND token = 'FQ66TasmPdmRosnN3ksoddJVmYx6zAfcMg/rwOItHMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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