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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cb4650950474a4a2e36ec34e16e4800cc1186dbc52258703e1ddf8003eed6565' 
  AND token = 'QpGDxaz1HlzCTquR+5je9s1Lb7hAaUvqqPs73TiFFOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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