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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '402225ae1ea1c25013334b7d28cff69a515b1c73efb7502df8cbbd3ff3e9a3f2' 
  AND token = 'Kvb0X3AbIjvVP3RYyzRMRXtGpQvEvr0bRdYE5vcGa4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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