Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea0e6f83d5c60080ef8833d0e907216a4edebb31d58298fbeae23060487ba8e3' 
  AND token = '1NtEBQ9SBVXW/AvjKgiZuxWIb0Ara0hSnXXpHqhUbP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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