Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6df96e8b2ca04ae96ba81f68d3204356c7704ec072a9d9de4344843951692cbd' 
  AND token = 'OpCvBxkCsyi97K/3Oa6lpCes/P0tK5iMneKZu0zZT8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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