Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9234675037011f833f435000fab2aa6d8dfcf98ce43199b49e78faf3937ffae4' 
  AND token = 't4/uopML0vwsle1SgJiq72l1LFUTyuibAESkEwsYAKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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