Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a2f19f8454510302edda24fabd4dd9edbcbf9f5a66e44142d5e34a17efdfc22' 
  AND token = 'uh7pwdz/E0vp7j9QvV0pX8Fg2WxLR8nhHY1PqHpHr0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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