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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '805c93b8995fe684807a1d824f6745850f5b78b87ec039c7f49143710f1365a4' 
  AND token = '9gq1xgfpw+VenYyVpQpVJTDSERb5H1amXb1m6+Owv1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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