Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f83b558e99c7587ab5751b55d23b1aa4041b69daa447bc63511df762c234955' 
  AND token = 'AbKIMDWIg45jyO6aKHKZoyIWdqhXceL2t6TeE452AVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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