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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b8b6d8d800b310063714d59815a57fed40b9655228b098215440d8419462ab19' 
  AND token = 'fIPJu21Lzk6MRzRncE3BwDysvDyF5NEom+QTYilVb8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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