Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae5f15be47f11aaa07c1aaedc6858884f9c5242b99f4a2a9a821b03b3afab1ac' 
  AND token = 'zKqt71vIsctuZD1TPgLtJEu6AoXa3/W/zARihF84dQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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