Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a960d575f1b02238a8be899736d42da0ee068f07ea2639c6b84c7f56e65c9af5' 
  AND token = 'isuijBmofJWeP4jzbI1ImYaDew2zlU6ND4iKbIJYDVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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