Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '238999188601df8da61a65286f299ab3e0549bff3fb9b367aab97094f2bb435e' 
  AND token = 'ydf0RTmrpBN+rE1rGj3k4d1F1eFmNMEMjXjR7SwBddA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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