Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb794590b96661a88523e204d1f4275d5e301dcba9c95401694288c13af7e1cd' 
  AND token = '3N/XgC+v18rMMdWO0DouJFQZxv0yPrHMpvSPR1pVNoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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