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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a405fef139753ed1cb29ac4a952fecfb3896e3e6d948440190374eec2560b778' 
  AND token = 'jUqkyPoN+gqNqRPEzxQoI/fJmunueNMW0sJFueE65Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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