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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'aff2b926127d978a55de9f75c84ebee07587d98564391a9581a435a9e3912d20' 
  AND token = 'AqGJ1KzxuI/u03IGsW//3yaqwEIJ8CnDB4GFwo6MAbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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