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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7a6dcc9835b04df30e7e0ca17a56a21425bd239021d7f85c135c87e1ef072506' 
  AND token = 'AATQcdR6vS+Q0PWsa8lWam6by0h0hG2JKYaBWB5Fjx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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