Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'dfcae0e73a9db07b0eae792fc7b0aa8db4618b7c5e24e8460d7597162396fa43' 
  AND token = '+To5yz00f+O75dTzjvy/WI2uxH5Zd9RmLK/Wb+gVt0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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