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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd53acbe3c6d0f3fdc35b79f5149581e9ed9d7fa318353c9bf2b397091b081b6c' 
  AND token = 'YBBZuacHC8TLGpKDxK8CnZzHn43GNN87b5qi8cKns3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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