SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7581b63433fa03d6f55466a1fdc2dc0d38764c662c35895df3ba1a05e53fb085' 
  AND token = 'k9LAw+QAbaZOPJRzG1QxiUPmMOJ7J+F9srLXVw8uviA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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