Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '38855824ce17d3998a0455e97998ee65db901261b025a6742b7ce83ddf805aba' 
  AND token = 'ou9XE6NSrLLoR8T1NfO3lB9l30WRaTowbtvVFNNfYkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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