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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '28dfa9f724601236d71758e4a1f73d297466b0d757bfc97ee2ab65966db3a828' 
  AND token = '8iR2h2vnB7uI0DUZ3DiuXFeKhJ6KfF5Eom5jUCWoUR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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