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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f7159c13f921512c1872bf1a24b7d94d2e549c9c67484b089e9d02a54993cadc' 
  AND token = 'l1C+2atwIYz8/mGP56a7IoXNKJRZfzTA84+Hh5AhiUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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