Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49681466eb9023109b0e67472b1519d78114d7ead0f7b49c6cd719bb080a8211' 
  AND token = 'eVgPwRhy49EWy0ztT6gfQG5xgXMaxHtG67WI5e4jT34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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