Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2485cf0af15dbd3068e9abc21c438854ff2f437073984313e37cb1d25efab19b' 
  AND token = 'YSb34Ggd3EjmUZSelIQfixzUJBX4CQCjUF7lCWBZQWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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