Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d8959206a5e4edc2d490ec550c7831c765a2613ad76e89c1d661f38d5c133a8' 
  AND token = 'BB6PeHRJWmhQcvYbbdkdoBIjrigKpTv36dQvQ69maro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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