SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '60f4610e1a2dad69646141ec2d99533b76e0772adbb0ccc937b95e9136fc21e7' 
  AND token = 'juZysfd/pLq9Tc7YfxEOVCFkcGD+YgdHQxLjCwTqRDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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