Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a3f07b24ee791149e3145f7f9edf8a36161c0aa95b332fbe84cbefc8b3448e77' 
  AND token = '2z1yU8PDlqVtP9qKJfpfF1Pq5P6MMUQcIWAYR1gl6kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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