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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '81377c483400fa1fbf6d4f39ef54ad9ee57896bce190130ab5512281b1e91d71' 
  AND token = '8DeEIofKbZP+gnlsLiUDQsEqukIxF3h5V+4H88LcVn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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