Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8a24c77b0b3af292e207934e64f5b6364687aea8eece2ee83e8ebfe9eabb5bd' 
  AND token = 'H3JG2J/mG6XoCtV+7qqNOnaKmYDxNZZuGbAV5J1HmnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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