Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '533c3e8a1c621caf207e50acdc1a071922b8de6686756ba497b9dcb26d049118' 
  AND token = '2w7RPo1rS56I9Px00e0wmf3tGSI5EPTBJsC4JGuZOzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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