Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f4a9d59a4c65284e7747774ad0e8ff809fcf15edfc1114e7943007c0316fe77' 
  AND token = 'fKwz8jDYMpdrU/c+jNK5dpTKSsKiChWtcn33XWclWX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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