Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d38345fcaaa47ef17650f1f9dbe32253c4f9d9c17105d37962f270a8af0bb58' 
  AND token = 'S/i/dMLU8lY8ycxxj/ONl9ES/SyFglhssKaizw71bq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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