Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'facf4b4b89c093f6933fc7837ea819e91e1ce12327e92cce9025a9da829edaf7' 
  AND token = 'UJGGkVUHaNzAQeCc/VQ29yaxNNbK3t5IbTrMtrKJY9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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