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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '704ff6f917e3d5ec03878508e1dc1798ce60b4339c74e86a1916a49a02d0b784' 
  AND token = '4gj7qFCu4XNBteMlDBSQeFNxch/rVzFiJpsgM+E8MNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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