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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4cf6a944b7807da407a6bb4634e38b4c906775f3da50c5f97b3c36111eb0a933' 
  AND token = '3Zf4UZeN7eKHR6wkkklx56tHVWb9OZX3CKaZj/S8/bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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