Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76f59ec085bfd2cb6827a174c8b101a0cc319a4f98bcfb867175b04d085c8b40' 
  AND token = 'B1HYwBY8dqwE0NhwjeFr1SzKBHazPk+zy5kaNzV8vlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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