SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '070f96a83803ef59b88e056a3410b187950460bf99c5b23bbc5f34c5f03094a6' 
  AND token = 'PDB2nJI6q+RbpPtpCrguxvcK1OAuZmEfSjy7dcIVIBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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