Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9b58099f9f3670189e6293fc0662d5cfe3bf00c2d6cd08edcba2bcdd1992d98' 
  AND token = 'OQuNQ9VgkwaV534gXcD+4o/5oHhbF8j25VKkQgo4HuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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