Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54f16088085ac18fb2169df1236fabd478a564581fed7fe94d77a0f266323f10' 
  AND token = '1dm2NxegJ/ksh6fAq/L/UYOfvgoun2kwfIkcTr/1Qu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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