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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1144bbba184e9005b7e5bbf32d07c0073aa4a6338af4f2bf17075a9fb3f72b8b' 
  AND token = '2jAeXH9O+9Qgpx/iLL80PCPFRekT6ZnGaZGFYfo8ipA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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