Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b614e94b636f0fde18a608789bdf942f19b5aa7eaee28e48e0dc16d36cff838' 
  AND token = 'u7qHAQsq6aJwsdXD3EnsNwiJ5CrMcgKehVMjkdwDFJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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