Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cec322b285e1ba6e1a3de5edfce06607aac7785d42d83ca168e2f2939edfc0c' 
  AND token = 'Y+qqVgODCoVWKXjELuqkk/5Xe/SK6Ud0fa3Y3bojY64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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