Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a7da3081c67e4420f5860dc8ff6d7d59d1a33a26b3d904520ad524b311783cd8' 
  AND token = 'JtwB0Y9kpOc7don9V6bTiOPR9U5N2oSfzAqEAGiNR4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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