Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c2e0119e5876ad71f6256eafb358fab4cd2a9a951aa3bea12c16cbc82ef8f1d' 
  AND token = 'RiaYX/4MKzDT8CPmNkFVS6zVTwzzUw30OhbENTNn2aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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