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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'dcda693ff9e00f1ac7bd89034ae5e9acf825cfd597924b5e4d346b9d887f257c' 
  AND token = 'AyAYlU7Wjz8HiRzu1brXTXLPShaqVRd6MCPaxeGNYgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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