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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7976968e51ee0d20d5ff7f861b05f78fe36f61d667ceaa4a55858b1ba080d59f' 
  AND token = 'v/lhOC8W7xkINpKRqdwOWUVdp/7Y2SuJyFNiyGs8c98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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