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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '57ab9384e8bd251557f7dd38c5caf2150ee34ebb60957feb211fc795cc391b4c' 
  AND token = 'uBwn0UK+nmK4N5Nro74Svll8rZU0F8k3dxNtz84g65E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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