Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b9ead4d12c01e2227e753b6a174c8b11239ba4109a6a656ffd638e4ca7b309e1' 
  AND token = 'N6rcf9dqli7SnxXdO+FKKcUwAhDcKa8p9UIigS/pPQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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