SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9d327795d0a0d9d5aba437bf74481d48c186eaafedac548433f02275ab28b534' 
  AND token = 'jld94qSuu/HxWYC/OR6+jEsBMB7KUzwKSvSZKUd4XXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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