Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2f599665ecc401c9346f82ab18dd7a746eff1b7e29f1f9f1eba5ce6f849b11a4' 
  AND token = 'VAVAUvtNMVx9KyPA8hNKYZxnVopH62OfB3m1JYmcqkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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