Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ad8b37cb1d99073ec57cfb2d78688f5797484fbe4d2a6cd646315c30951b338' 
  AND token = 'K5jULlXCAhm2iO/1d+N4aS5X3mm/fGyXCyVQ02bP8MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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