Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d368f7538cd3e6a5302278e0ced4361231efe2fe28d35d94c51fc76001dcd0' 
  AND token = '0D6wHP6uoU2Y6CzYHK63jfB8b/0vFiNW5vjrMkCDCwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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