SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '01c41c64637122e496e65ecd13726e3ce30dd9cb9c08c22243bc2ab951372446' 
  AND token = 'mJnCBDa6nleHvkgw+Q5Jq+/oK6Bs9ZZfVJk/DDLpJ7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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