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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4e91ec82f7e6ab40dcfd88beffb15d239feffc88a76cb7eb9c9b78e50b057c2f' 
  AND token = 'VndvWUVW32x4PoOKXE5i9IWPj7qCZyUz/GpXnq79LNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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