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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '21950150b40b93d3b8aaf9e8a555b5fde8c953ee2da56a2992e6d3ca276868b9' 
  AND token = 'buVrx3xttRZG79LDmNIqldUyXM0LUOJ2rf8qmRefh3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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