Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef13f1a0f804e30471e7ae9abc36464a980236d29bcb8a7ef73360a990d9e439' 
  AND token = 'w6gWQwxZSf3buIcQnOQNOGW4+lKGxmM+HXNgqpPSoRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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