Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6433f36e15040811390d4974f4c2284810dd562bfc495135c733909c50dede3e' 
  AND token = 'FIvdZLAVbckrERuuGdFS2reCn8aqPRm2n9PgUCiB4Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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