Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '53262b525dad734ed59244e1e429f0ab8602b3e9e9d290a9c74c68724ffb5ea9' 
  AND token = '9amZzQOyVbx2OWGjhcpyloN58BURorDNyc8SVvXDFjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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