Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f8459a40335a68d382e0f3c3e380eb43a3a2b0309f806961d9f3ca93e24a8cd' 
  AND token = '3aB1eT39ohqvR9XHc5IL2kc5hC41CH9B9zZm8JYW1Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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