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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1373881fea0da1ed62c87586c9855c62c008a3a5704b55af737f793fcec0c7fc' 
  AND token = '0Cck8UC3+Lpuqbly9ZzD/pGgA7TXvSrLok0ziZ6N65g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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