Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '221ebb70f54f17a3b9596af5ef954f59ed1f1eadcb545de8a7c1e66e17bf973e' 
  AND token = 'vMYMASqiKw8NFs6A2ESEaCVtc9EogsgAYGR4LPGZMbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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