Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98909fc7d3d076ef4f607fd8fcc5af39bf786debabc0404c47fa2e97741a5d97' 
  AND token = 'MOEkijkPLRy5//lRXvkTFrISWQuNxkS6KEffnvv+SZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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