Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab254cfd80a2e3f4199979f9df091b0a951e00f763a7bd7d1acc03003ae3f78c' 
  AND token = 'HJzG0rwnQBZ3rrtjTXabdrrxwAKf5isuS9KXdUoI/cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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